rainbow smelt vs Osmerus mordax

rainbow smelt and Osmerus mordax both are nouns.

Word	Noun	Adjective	Verb	Adverb
rainbow smelt	Yes	No	No	No
Osmerus mordax	Yes	No	No	No

As nouns, rainbow smelt and Osmerus mordax are synonyms defined as:

rainbow smelt and Osmerus mordax: important marine and landlocked food fish of eastern North America and Alaska

rainbow smelt (noun)	Osmerus mordax (noun)
important marine and landlocked food fish of eastern North America and Alaska	important marine and landlocked food fish of eastern North America and Alaska
common smelt of eastern North America and Alaska